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Mount Diablo Mine (Mt. Diablo Mine; Diablo Mine; Ryne Mine), Mount Diablo (Mt Diablo), Mount Diablo State Park, Clayton, Diablo Range, Contra Costa Co., California, USA
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Mount Diablo Mine, Mount Diablo, Mount Diablo State Park, Clayton, Diablo Range, Contra Costa Co., California, USA

Photo: O. Dziallas
Latitude: 37°52'54"N
Longitude: 121°54'46"W
A former Hg mine located in the SE¼ sec. 29, T1N, R1E, MDM, on the E side of Mount Diablo. The Mount Diablo Mine and the Ryne Mine were consolidated in 1930. Worked 1875-1877 and again briefly in 1930.

Mineralization is along the contact of a diapir (upthrust plug) of Franciscan sediments and serpentine intruded into sedimentary rocks of the Great Valley sequence. Near the mine much serpentine has been converted to silica-carbonate rock.

Mineral List

Hypercinnabar (TL)
var: Illite

'Roméite Group
var: Stibiconite'


24 entries listed. 22 valid minerals. 1 type locality (valid mineral).

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Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 377.

Ross, C.P. (1940a) Quicksilver deposits of the Mount Diablo region, Contra Costa County, California. USGS Bulletin 922-B, 54 pp.: 41, 42, 44.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 492.

Pampeyan, Earl Haig (1963), Geology and mineral deposits of Mount Diablo, Contra Costa County, California: California Division Mines & Geol., Special Report 80, 31 pp.: 24.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 148, 156, 178, 213, 254, 258, 261, 323, 332, 337, 349, 379, 382.

White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 585, 591.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 64, 74, 127, 185, 263, 264, 266, 270, 273, 274, 275, 278, 303, 351, 427.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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